1 files changed, 94 insertions, 0 deletions
diff --git a/js/dojo-1.7.2/dojox/gfx/gradutils.js b/js/dojo-1.7.2/dojox/gfx/gradutils.js
new file mode 100644
index 0000000..e93e5cb
--- /dev/null
+++ b/js/dojo-1.7.2/dojox/gfx/gradutils.js
@@ -0,0 +1,94 @@
+//>>built
+// Various generic utilities to deal with a linear gradient
+
+define("dojox/gfx/gradutils", ["./_base", "dojo/_base/lang", "./matrix", "dojo/_base/Color"], 
+  function(g, lang, m, Color){
+  
+	/*===== g= dojox.gfx =====*/
+	var gradutils = g.gradutils = {};
+	/*===== g= dojox.gfx; gradutils = dojox.gfx.gradutils; =====*/
+
+	function findColor(o, c){
+		if(o <= 0){
+			return c[0].color;
+		}
+		var len = c.length;
+		if(o >= 1){
+			return c[len - 1].color;
+		}
+		//TODO: use binary search
+		for(var i = 0; i < len; ++i){
+			var stop = c[i];
+			if(stop.offset >= o){
+				if(i){
+					var prev = c[i - 1];
+					return Color.blendColors(new Color(prev.color), new Color(stop.color),
+						(o - prev.offset) / (stop.offset - prev.offset));
+				}
+				return stop.color;
+			}
+		}
+		return c[len - 1].color;
+	}
+
+	gradutils.getColor = function(fill, pt){
+		// summary:
+		//		sample a color from a gradient using a point
+		// fill: Object:
+		//		fill object
+		// pt: dojox.gfx.Point:
+		//		point where to sample a color
+		var o;
+		if(fill){
+			switch(fill.type){
+				case "linear":
+					var angle = Math.atan2(fill.y2 - fill.y1, fill.x2 - fill.x1),
+						rotation = m.rotate(-angle),
+						projection = m.project(fill.x2 - fill.x1, fill.y2 - fill.y1),
+						p = m.multiplyPoint(projection, pt),
+						pf1 = m.multiplyPoint(projection, fill.x1, fill.y1),
+						pf2 = m.multiplyPoint(projection, fill.x2, fill.y2),
+						scale = m.multiplyPoint(rotation, pf2.x - pf1.x, pf2.y - pf1.y).x;
+					o = m.multiplyPoint(rotation, p.x - pf1.x, p.y - pf1.y).x / scale;
+					break;
+				case "radial":
+					var dx = pt.x - fill.cx, dy = pt.y - fill.cy;
+					o = Math.sqrt(dx * dx + dy * dy) / fill.r;
+					break;
+			}
+			return findColor(o, fill.colors);	// dojo.Color
+		}
+		// simple color
+		return new Color(fill || [0, 0, 0, 0]);	// dojo.Color
+	};
+
+	gradutils.reverse = function(fill){
+		// summary:
+		//		reverses a gradient
+		// fill: Object:
+		//		fill object
+		if(fill){
+			switch(fill.type){
+				case "linear":
+				case "radial":
+					fill = lang.delegate(fill);
+					if(fill.colors){
+						var c = fill.colors, l = c.length, i = 0, stop,
+							n = fill.colors = new Array(c.length);
+						for(; i < l; ++i){
+							stop = c[i];
+							n[i] = {
+								offset: 1 - stop.offset,
+								color:  stop.color
+							};
+						}
+						n.sort(function(a, b){ return a.offset - b.offset; });
+					}
+					break;
+			}
+		}
+		return fill;	// Object
+	};
+
+	return gradutils;
+});